class_docstr: Lexer for raw E-mail.
  
  Additional options accepted:
  
  `highlight-X-header`
      Highlight the fields of ``X-`` user-defined email header. (default:
      ``False``).
  
  .. versionadded:: 2.5
code: def __init__(self, **options):
      super().__init__(EmailHeaderLexer, MIMELexer, Comment, **options)
  
file_path: catboost/contrib/python/Pygments/py3/pygments/lexers/email.py
imports: from pygments.lexer import RegexLexer, DelegatingLexer, bygroups
  from pygments.lexers.mime import MIMELexer
  from pygments.token import Text, Keyword, Name, String, Number, Comment
  from pygments.util import get_bool_opt
label_desc: Use image node_id 1 to create a new EmailLexer object from inherited base classes: DelegatingLexer with example: obj = EmailLexer()